Issue 201 - Mark selected key with blue (#290)

* issue-201: initial try

* revert: remove first solution related changes

* feature: change the colour of selected key to blue (empty key selection case not covered)

* typescript: prevent errors in editors due to missing tsconfig for shared

* cleanup: remove unused import

* fix: solve empty key case, pass down selected layerId, moduleId and keyId

* cleanup: remove console.log statement

* cleanup: remove extra line

* review: animation delay shorter, exactly as short as the animation delay of the popover

* review: prevent remaining signature blue when click twice on a key in rapid succession

* review: right signature colour after blending (http://colorblendy.com/#!/multiply/4099e5/cccccc)

* review comments fixes

* review: use simplified condition with help of ‘?’

shared/src/tsconfig.json

@@ -0,0 +1,27 @@
+{
+  "compilerOptions": {
+    "target": "es5",
+    "module": "commonjs",
+    "moduleResolution": "node",
+    "sourceMap": true,
+    "emitDecoratorMetadata": true,
+    "experimentalDecorators": true,
+    "removeComments": false,
+    "noImplicitAny": true,
+    "suppressImplicitAnyIndexErrors": true,
+    "typeRoots": [
+      "../../node_modules/@types"
+    ],
+    "types": [
+      "node",
+      "jquery",
+      "core-js",
+      "select2",
+      "file-saver"
+    ]
+  },
+  "exclude": [
+    "node_modules",
+    "config-serializer"
+  ]
+}